There is literally no reason behind wearing a mask in a movie theater. You think you're saying that you are are scared of a disease, but what you're actually saying is that you would risk going into a diseased crowd to see capeshit, which doesn't make any goddamned sense, if you think you are genuinely at risk.
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No reason to wear a mask at all. Especially if it’s not actually fitted and real (I used to go into cold rooms/work at Quest and Thermo fisher Scientific) and the only way to really wear a mask in hazmat labs is fitted/no facial hair/scrubbed out and vacuumed up in room first 🤷♂️👊